As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, MAIN DECK SIDE CARGO DOOR LIGHT ILLUMINATED. EMERGENCY DECLARED. 180,000 LBS OF FUEL WAS JETTISONED AND PRECAUTIONARY RETURN TO ICN WAS COMPLETED. WARNING LIGHTS REMAINED ILLUMINATED AT BLOCK IN. UPON INSPECTION, FOUND LATCH IN THE UNLOCKED POSITION. INSIDE AND OUTSIDE MAIN DECK SIDE DOOR LATCH CHECKED NORMAL PER MM 52-71-00 PG 508. DOOR WARNING LIGHT SYS CHECK OK.